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Xceed DataGrid for WPF v7.3 Documentation
Xceed.Wpf.DataGrid Assembly / Xceed.Wpf.DataGrid Namespace / DataGridBindingInfo Class
Members Example


In This Topic
    DataGridBindingInfo Class
    In This Topic
    Class that creates and wraps a binding that is used by a column to retrieve and validate its values.
    Syntax
    'Declaration
 
Public Class DataGridBindingInfo 
    'Usage
 
Dim instance As DataGridBindingInfo
    public class DataGridBindingInfo
    Remarks

    The following table provides a list of the underlying binding's properties and their immutable values.

    Property Value
    Mode Property BindingMode.TwoWay (see ReadOnly property)
    UpdateSourceTrigger Property UpdateSourceTriggerExplicit (see UpdateSourceTrigger property)
    ValidatesOnDataErrors Property true
    ValidatesOnExceptions Property true
    NotifyOnTargetUpdated Property true
    NotifyOnValidationError Property true
    Example

    All examples in this topic assume that the grid is bound to a list of Composer objects, unless stated otherwise.

    The following example demonstrates how to create a custom ValidationRule and apply it to a column's binding to provide binding-level validation.Implementation of the YearValidationRule validation rule.Implementation of the YearValidationRule validation rule.
    <Grid xmlns:xcdg="http://schemas.xceed.com/wpf/xaml/datagrid"
     xmlns:local="clr-namespace:Xceed.Wpf.Documentation">
  <Grid.Resources>
     <xcdg:DataGridCollectionViewSource x:Key="cvs_composers"
                                        Source="{Binding Source={x:Static Application.Current}, 
                                                         Path=Composers}"/>
  </Grid.Resources>
 
  <xcdg:DataGridControl ItemsSource="{Binding Source={StaticResource cvs_composers}}"
                        UpdateSourceTrigger="RowEndingEdit">
     <xcdg:DataGridControl.Columns> 
       <xcdg:Column FieldName="BirthYear">
          <xcdg:Column.DisplayMemberBindingInfo>
             <xcdg:DataGridBindingInfo Path="BirthYear">
                <xcdg:DataGridBindingInfo.ValidationRules>
                   <local:YearValidationRule />
                </xcdg:DataGridBindingInfo.ValidationRules>
             </xcdg:DataGridBindingInfo>
          </xcdg:Column.DisplayMemberBindingInfo>
       </xcdg:Column>

       <xcdg:Column FieldName="DeathYear">
          <xcdg:Column.DisplayMemberBindingInfo>
             <xcdg:DataGridBindingInfo Path="DeathYear">
                <xcdg:DataGridBindingInfo.ValidationRules>
                   <local:YearValidationRule />
                </xcdg:DataGridBindingInfo.ValidationRules>
             </xcdg:DataGridBindingInfo>
          </xcdg:Column.DisplayMemberBindingInfo>
       </xcdg:Column>      
    </xcdg:DataGridControl.Columns>
  </xcdg:DataGridControl>
</Grid>
    Imports System
Imports System.Windows.Controls
Imports System.Globalization
Namespace Xceed.Wpf.Documentation

  Public Class YearValidationRule
               Inherits ValidationRule

    Public Overrides Function Validate( ByVal value As Object, _
                                        ByVal cultureInfo As CultureInfo ) As ValidationResult
      Dim year As Integer = CInt( value )
      If year > DateTime.Now.Year Then
        Return New ValidationResult( False, "Chosen year cannot be greater than this year." )
      End If
      Return ValidationResult.ValidResult
    End Function
  End Class
End Namespace
    using System;
using System.Windows.Controls;
using System.Globalization;
namespace Xceed.Wpf.Documentation
{

 public class YearValidationRule : ValidationRule
 {
   public override ValidationResult Validate( object value, CultureInfo cultureInfo )
   {
     int year = ( int )value;
     if( year > DateTime.Now.Year )
       return new ValidationResult( false, "Chosen year cannot be greater than this year." );
     return ValidationResult.ValidResult;
   }
 }
}
    Inheritance Hierarchy

    System.Object
       Xceed.Wpf.DataGrid.DataGridBindingInfo

    Public Constructors
     NameDescription
    Public ConstructorDataGridBindingInfo ConstructorInitializes a new instance of the DataGridBindingInfo class.  
    Top
    Public Properties
     NameDescription
    Public PropertyBindsDirectlyToSourceGets or sets a value indicating whether the Path is evaluated relative to the data item or the data source.  
    Public PropertyConverterGets or sets the convert that will be used to convert the value returned by the binding.  
    Public PropertyConverterCultureGets or sets the CultureInfo in which the values returned by the Converter will be evaluated.  
    Public PropertyConverterParameterGets or sets the parameter that will be passed to the Converter.  
    Public PropertyElementNameGets or sets the name of the element that will be used as the binding source object.  
    Public PropertyFallbackValueGets or sets the value that will be used when the binding is unable to return a value.  
    Public PropertyIsAsyncGets or sets a value that indicates whether the Binding should get and set values asynchronously. Use FallBackValue to display something while waiting for the value to arrive.  
    Public PropertyNotifyOnSourceUpdatedGets or sets a value indicating whether to provide notification when a value is transferred from the binding target to the binding source.  
    Public PropertyPathGets or sets the path to the binding source property.  
    Public PropertyReadOnlyGets or sets a value indicate whether the binding is read-only.  
    Public PropertyUpdateSourceExceptionFilterGets or sets a callback that can be handled to provide custom logic for when an exception is thrown by the binding engine during the update of the binding source value.  
    Public PropertyValidationRulesGets a collection of rules that will be used to validate user input.  
    Public PropertyXPathGets or sets the XPath query that returns the value to use on the XML binding source.  
    Top
    Requirements

    See Also

    Reference

    DataGridBindingInfo Members
    Xceed.Wpf.DataGrid Namespace

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